I find that almost every time something breaks it's really because I haven't been careful enough. What you need to do is watch out for any messages during updating (especially during kernel updates) and make sure to just use sudo carefully etc.

I also want to add that while people always seem to talk about Arch breaking, it has hardly broken more for me that Windows of Ubuntu have in the same period of time. The advantage is that when Arch breaks, you fix it because you just tend to really learn how your system works when you use Arch, while in Windows and Ubuntu, I'd just reinstall usually.

I use Arch as my only OS, for day-to-day use, and it's perfectly stable when I'm not actively experimenting etc.